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This paper presents a method to operate a grid connected hybrid system. The hybrid system composed of a Photovoltaic (PV) array, Proton exchange membrane fuel cell (PEMFC) and wind energy is considered. Two operation modes, the unit -power control (UPC) mode and the feeder-flow control (FFC) mode, can be applied to the hybrid system. In the UPC mode, variations of load demand are compensated by the main grid because the hybrid source output is regulated to reference power. Renewable energy is... Topics: PV Array, Fuel cell, Wind Mill, UPC Mode, FFC Mode.